RT Journal Article SR Electronic T1 Increase in walk distance is not enough evidence to add a walk to the 6-minute walk test JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1239 OP 1240 DO 10.1183/09031936.00113211 VO 38 IS 5 A1 H.S. Kulkarni A1 D. Chandra A1 F.C. Sciurba YR 2011 UL http://erj.ersjournals.com/content/38/5/1239.abstract AB